Isolation measurement monitoring for ASIL applications
11714111 · 2023-08-01
Assignee
Inventors
Cpc classification
G01R27/14
PHYSICS
G01R27/025
PHYSICS
International classification
G01R27/02
PHYSICS
Abstract
An electric circuit according to an embodiment of the present disclosure includes only a single amperemeter configured to measure either a positive current or a negative current through a respective measurement resistance between a respective high voltage potential and a common ground potential. The respective actual measurement resistance value of the unmeasured measurement resistance is calculated by applying a respectively calculated actual measurement resistance value of the respective measured measurement resistance, a calculated actual positive isolation resistance value, and a calculated negative isolation resistance value.
Claims
1. An electric circuit for monitoring isolation resistance measurement within a high voltage board net of an electronic vehicle, the electric circuit comprising: a high voltage (HV) power system having a positive high voltage potential and a negative high voltage potential with a common ground potential being defined between a positive isolation resistance and a negative isolation resistance, the positive isolation resistance and the negative isolation resistance being connected in series and parallel to the HV power system between the positive high voltage potential and the negative high voltage potential; a positive measurement resistance connected in parallel to the positive isolation resistance between the positive high voltage potential and the ground potential; a negative measurement resistance connected in parallel to the negative isolation resistance between the negative high voltage potential and the ground potential; a positive voltage meter between the positive high voltage potential and the ground potential; a negative voltage meter between the negative high voltage potential and the ground potential; and only a single amperemeter configured to measure either a positive current through the positive measurement resistance between the positive high voltage potential and the ground potential, or a negative current through the negative measurement resistance between the negative high voltage potential and the ground potential.
2. The electric circuit according to claim 1, further comprising a positive switch to control the positive current through the positive measurement resistance in relation to the ground potential.
3. The electric circuit according to claim 2, further comprising a negative switch to control the negative current through the negative measurement resistance in relation to the ground potential.
4. The electric circuit according to claim 1, further comprising a negative switch to control the negative current through the negative measurement resistance in relation to the ground potential.
5. A method for monitoring isolation resistance measurement within a high voltage board net of an electronic vehicle by using the electric circuit according to claim 1, the method comprising: measuring a first voltage with the positive voltage meter between the positive high voltage potential and the ground potential as voltage drop across the positive isolation resistance and the positive measurement resistance connected in parallel; measuring a second voltage with the negative voltage meter between the negative high voltage potential and the ground potential as voltage drop across the negative isolation resistance and the negative measurement resistance connected in parallel; calculating an actual positive isolation resistance value by applying a known nominal positive measurement resistance value of the positive measurement resistance and the measured first voltage; calculating an actual negative isolation resistance value by applying a known nominal negative measurement resistance value of the negative measurement resistance and the measured second voltage; measuring a current through either the positive measurement resistance or the negative measurement resistance with the single amperemeter and calculating a respective actual measurement resistance value of the measured positive measurement resistance or negative measurement resistance; comparing the calculated respective actual measurement resistance value of the measured positive measurement resistance or negative measurement resistance with the respective known nominal resistance value.
6. The method according to claim 5, further comprising: calculating a respective actual measurement resistance value of the unmeasured one of the negative measurement resistance or positive measurement resistance by applying the respective calculated actual measurement resistance value of the measured positive measurement resistance or negative measurement resistance, the calculated actual positive isolation resistance value, and the calculated negative isolation resistance value; comparing the calculated respective actual measurement resistance value of the unmeasured one of the negative measurement resistance or positive measurement resistance with the respective known nominal resistance value.
7. The method according to claim 6, wherein the electric circuit further comprises a positive switch to control the positive current through the positive measurement resistance in relation to the ground potential, and wherein the method is applied to the electric circuit when the positive switch is closed.
8. The method according to claim 6, wherein the electric circuit further comprises a negative switch to control the negative current through the negative measurement resistance in relation to the ground potential, and wherein the method is applied to the electric circuit when the negative switch is closed.
9. A board net of an electronic vehicle, the board net comprising the electric circuit for monitoring isolation resistance measurement according to claim 1.
10. An electronic vehicle comprising the electric circuit for monitoring isolation resistance measurement according to claim 1.
11. An electric circuit for monitoring isolation resistance measurement within a high voltage board net of an electronic vehicle, the electric circuit comprising: a high voltage (HV) power system having a positive high voltage potential and a negative high voltage potential with a common ground potential being defined between a positive isolation resistance and a negative isolation resistance, the positive isolation resistance and the negative isolation resistance being connected in series and parallel to the HV power system between the positive high voltage potential and the negative high voltage potential; a positive measurement resistance connected in parallel to the positive isolation resistance between the positive high voltage potential and the ground potential; a negative measurement resistance connected in parallel to the negative isolation resistance between the negative high voltage potential and the ground potential; a positive voltage meter between the positive high voltage potential and the ground potential; a negative voltage meter between the negative high voltage potential and the ground potential; and an amperemeter between the positive measurement resistance and the common ground, the amperemeter being configured to measure a positive current through the positive measurement resistance between the positive high voltage potential and the ground potential, wherein no amperemeter is between the negative measurement resistance and the common ground.
12. The electric circuit according to claim 11, further comprising a positive switch to control the positive current through the positive measurement resistance in relation to the ground potential.
13. The electric circuit according to claim 12, further comprising a negative switch to control a negative current through the negative measurement resistance in relation to the ground potential.
14. The electric circuit according to claim 11, further comprising a negative switch to control a negative current through the negative measurement resistance in relation to the ground potential.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) The present disclosure will be described in further detail by reference to the FIGURE. The examples given are provided to describe the present disclosure but are not intended to limit the present disclosure. In the drawings:
(2) The FIGURE is a circuit diagram showing a circuit for monitoring isolation resistance measurement within the HV board net of an electronic vehicle according to an embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE DISCLOSURE
(3) Reference will now be made, in detail, to embodiments, examples of which are illustrated in the accompanying drawing. Aspects and features of the embodiments, and implementation methods thereof, will be described with reference to the accompanying drawing. Like reference numerals denote like elements, and redundant descriptions are omitted. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Further, the use of “may” when describing embodiments of the present disclosure refers to “one or more embodiments of the present disclosure.”
(4) It will be understood that although the terms “first,” “second,” etc. are used to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element may be named a second element and, similarly, a second element may be named a first element, without departing from the scope of the present disclosure.
(5) It will be further understood that the terms “have,” “include,” “comprise,” “having,” “including,” or “comprising” specify a property, a region, a fixed number, a step, a process, an element, a component, and a combination thereof but do not exclude other properties, regions, fixed numbers, steps, processes, elements, components, and combinations thereof.
(6) In the drawing, the sizes of elements may be exaggerated for clarity. For example, the size or thickness of each element may be arbitrarily shown for illustrative purposes, and thus, the embodiments of the present disclosure should not be construed as being limited thereto.
(7) Aspects and features of the present disclosure and methods of accomplishing the same may be understood more readily by reference to the following detailed description of embodiments and the accompanying drawing. Hereinafter, embodiments will be described in more detail with reference to the accompanying drawing. The present disclosure, however, may be embodied in various different forms, and should not be construed as being limited to only the illustrated embodiment. Rather, these embodiments are provided as examples so that this disclosure will be thorough and complete, and will fully convey the aspects and features of the present disclosure to those skilled in the art. Accordingly, processes, elements, and techniques that are not necessary to those having ordinary skill in the art to have a complete understanding of the aspects and features of the present disclosure may not be described.
(8) Spatially relative terms, such as “beneath”, “below”, “lower”, “under”, “above”, “upper”, and the like, may be used herein for ease of explanation to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or in operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” or “under” other elements or features would then be oriented “above” the other elements or features. Thus, the example terms “below” and “under” can encompass both an orientation of above and below. The device may be otherwise oriented (e.g. rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein should be interpreted accordingly.
(9) It will be understood that when an element or layer is referred to as being “on”, “connected to”, or “coupled to” another element or layer, it can be directly on, connected to, or coupled to the other element or layer, or one or more intervening elements or layers may be present. In addition, it will also be understood that when an element or layer is referred to as being “between” two elements or layers, it can be the only element or layer between the two elements or layers, or one or more intervening elements or layers may also be present.
(10) The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular forms “a”, “an”, and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Expressions such as “at least one of”, when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.
(11) Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and/or the present specification, and should not be interpreted in an idealized or overly formal sense, unless expressly so defined herein.
(12) The FIGURE shows a circuit diagram of an electric circuit for monitoring isolation resistance measurement within a high voltage (HV) board net of an electronic vehicle according to an embodiment of the present disclosure. The electric circuit includes a HV power system 10 providing a positive high voltage potential HV+ and a negative high voltage potential HV−, and a common ground potential GND/Chassis is defined in the middle between a positive isolation resistance R.sub.IsoP and a negative isolation resistance R.sub.IsoN. The positive isolation resistance R.sub.IsoP and the negative isolation resistance R.sub.IsoN are connected in series and parallel to the HV power system 10 between the positive high voltage potential HV+ and the negative high voltage potential HV−.
(13) The electric circuit further includes a positive measurement resistance R.sub.0_p connected in parallel to the positive isolation resistance R.sub.IsoP between the positive high voltage potential HV+ and the ground potential GND/Chassis; a negative measurement resistance R.sub.0_n connected in parallel to the negative isolation resistance R.sub.IsoN between the negative high voltage potential HV− and the ground potential GND/Chassis; a positive voltage meter U.sub.BAT_P between the positive high voltage potential HV+ and the ground potential GND/Chassis; and a negative voltage meter U.sub.BAT_N between the negative high voltage potential HV− and the ground potential GND/Chassis.
(14) The electric circuit includes only a single amperemeter I.sub.iso_p configured (e.g., permanently configured) to measure a positive current I.sub.iso_p through the positive measurement resistance R.sub.0_p between the positive high voltage potential HV+ and the ground potential GND/Chassis. The positive current I.sub.iso_p through the positive measurement resistance R.sub.0_p in relation to the ground potential GND/Chassis can be controlled on or off by a positive switch Pos.Iso-Switch.
(15) In another embodiment, however, a single amperemeter I.sub.iso_n is configured (e.g., permanently configured) to measure a negative current I.sub.iso_n through the negative measurement resistance R.sub.0_n between the negative high voltage potential HV− and the ground potential GND/Chassis. The negative current I.sub.iso_p through the negative measurement resistance R.sub.0_p in relation to the ground potential GND/Chassis can be controlled on or off by a negative switch Neg.Iso-Switch.
(16) For isolation resistance measurement, based on measured voltages U.sub.BAT_P (between the positive high voltage potential HV+ and the ground potential GND/Chassis) and U.sub.BAT_N (between the negative high voltage potential HV− and the ground potential GND/Chassis), the respective actual isolation resistance values R′.sub.IsoP and R′.sub.IsoN of the isolation resistances R.sub.IsoP and R.sub.IsoN can also be calculated by applying Ohm's law with known nominal resistance values R.sub.0_p and R.sub.0_n and compared with respective known nominal isolation resistance values R.sub.IsoP and R.sub.IsoN. A deviation between R′.sub.IsoP and R.sub.IsoP and/or between R′.sub.IsoN and R.sub.IsoN can be an indication of an error in the insulation resistance.
(17) However, for monitoring the isolation resistance measurement, the current I.sub.iso_p or I.sub.iso_n through either the positive measurement resistance R.sub.0_p or the negative measurement resistance R.sub.0_n is measured with the single amperemeter I.sub.iso_p and, based on the respective measured voltages U.sub.BAT_P (between the positive high voltage potential HV+ and the ground potential GND/Chassis) or U.sub.BAT_N (between the negative high voltage potential HV− and the ground potential GND/Chassis), the respective actual measurement resistance value R′.sub.0_p or R′.sub.0_n of the measured measurement resistance value R′.sub.0_p or R′.sub.0_n can be calculated by applying Ohm's law and compared with the respective known nominal measurement resistance value R.sub.0_p or R.sub.0_n. A respective deviation between R′.sub.0_p and R.sub.0_p or between R′.sub.0_n and R.sub.0_n can be an indication of an error in the insulation resistance measurement.
(18) In addition, the respective actual measurement resistance value R′.sub.0_n or R′.sub.0_p of the unmeasured measurement resistance R.sub.0_n or R.sub.0_p can be calculated by applying the respective calculated actual measurement resistance value R′.sub.0_p or R′.sub.0_n of the measured measurement resistance R.sub.0_p or R.sub.0_n, the calculated actual positive isolation resistance value R′.sub.IsoP and the negative isolation resistance value R′.sub.IsoN, and compared with a respective known nominal resistance value R.sub.0_n or R.sub.0_p. A respective deviation between R′.sub.0_n and R.sub.0_n or between R′.sub.0_p and R.sub.0_p can be an indication of an error in the insulation resistance measurement. This method of monitoring isolation resistance measurement according to the disclosure includes only two high voltage measurements and only one current measurement.
(19) TABLE-US-00001 Some Reference Numerals 10 HV power system (e.g., a battery systems or supply system) HV+ positive high voltage potential HV− negative high voltage potential GND/Chassis (chassis) ground R.sub.IsoP positive isolation resistance (value R.sub.IsoP nominal, R′.sub.IsoP measured) R.sub.IsoN negative isolation resistance (value R.sub.IsoN nominal, R′.sub.IsoN measured) R.sub.0.sub.